CN110542809B - Method for testing radiation immunity of radio frequency electromagnetic field of transmission type electronic equipment - Google Patents
Method for testing radiation immunity of radio frequency electromagnetic field of transmission type electronic equipment Download PDFInfo
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- CN110542809B CN110542809B CN201910765575.5A CN201910765575A CN110542809B CN 110542809 B CN110542809 B CN 110542809B CN 201910765575 A CN201910765575 A CN 201910765575A CN 110542809 B CN110542809 B CN 110542809B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to the technical field of electromagnetic compatibility testing, and discloses a method for testing radiation immunity of a radio frequency electromagnetic field of transmission type electronic equipment, which comprises the following steps: placing a plurality of devices to be tested in an anechoic chamber, and mutually isolating the devices to be tested by using an isolation plate; arranging a transmitting antenna in the anechoic chamber, and focusing the electromagnetic wave transmitted by the transmitting antenna; adjusting the advancing direction of the electromagnetic waves, sequentially aligning the electromagnetic waves to a plurality of devices to be tested, and sequentially detecting a single device to be tested; when the transmitting direction of the transmitting antenna is aligned to different devices to be tested, the focusing degree is adjusted according to the preset electromagnetic intensity, and the focusing degree and the electromagnetic intensity are in positive correlation setting; adjusting the reflection degree of the isolation board to the electromagnetic wave emitted by the transmitting antenna, wherein the reflection degree and the electromagnetic intensity are in positive correlation; the method has the advantage of being capable of testing quickly and accurately.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility testing, in particular to a method for testing radiation immunity of a radio frequency electromagnetic field of transmission type electronic equipment.
Background
The radio frequency electromagnetic field radiation immunity test is to test electrical and electronic equipment and see the performance of the product when the radio frequency electromagnetic field radiates. The interference of radio frequency radiation electromagnetic field to the equipment is often generated by the electromagnetic radiation source (which belongs to intentional emission) of equipment operation, maintenance and safety inspection personnel using mobile phones, radio stations, television transmitting stations, mobile radio transmitters and the like, and the radio frequency radiation interference is also generated by parasitic radiation (which belongs to unintentional emission) generated when automobile ignition devices, electric welding machines, thyristor rectifiers and fluorescent lamps work. Testing generally refers to electromagnetic compatibility testing, i.e., the ability of a device or system to perform satisfactorily in its electromagnetic environment without producing intolerable electromagnetic interference to any device in its environment. Electromagnetic compatibility tests include electromagnetic immunity tests (EMS) and electromagnetic disturbance tests (EMI). An important item of electromagnetic immunity testing (EMS) is the radio frequency electromagnetic field radiation immunity testing (RS), which is performed in anechoic chambers conforming to international and national standards.
The anechoic chamber is simply a closed space with wave-absorbing materials stuck on the wall, which meets the requirements of various indexes. The traditional test mode is that after the test of one tested object is finished, a tester enters an anechoic chamber to replace the next tested object, the test is sequentially and repeatedly carried out, the preparation time of the process is long, and the test time of the tested objects in different batches is limited due to the fact that the number of the tested objects is large, and therefore the test cannot be rapidly and accurately carried out.
Disclosure of Invention
The invention provides a method for testing the radiation immunity of a radio frequency electromagnetic field of transmission type electronic equipment, which aims at solving the technical problem that the traditional RS test mode can not test quickly and accurately.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for testing radiation immunity of radio frequency electromagnetic field of transmission electronic equipment includes the following steps:
placing a plurality of devices to be tested in an anechoic chamber, and mutually isolating the devices to be tested by using an isolation plate;
arranging a transmitting antenna in an anechoic chamber, and focusing electromagnetic waves transmitted by the transmitting antenna;
adjusting the advancing direction of electromagnetic waves, sequentially aligning to a plurality of devices to be tested, and sequentially detecting a single device to be tested;
when the transmitting direction of the transmitting antenna is aligned to different devices to be tested, the focusing degree is adjusted according to the preset electromagnetic intensity, and the focusing degree and the electromagnetic intensity are in positive correlation setting;
and adjusting the reflection degree of the electromagnetic wave emitted by the transmitting antenna by the isolating plate, wherein the reflection degree and the electromagnetic intensity are in positive correlation setting.
By the technical scheme, the focused electromagnetic wave can enable the transmitting antenna to be more concentrated, the test on batch devices to be tested is facilitated, the single device to be tested can be tested by adjusting the advancing direction of the electromagnetic wave, the different devices can be tested according to the preset electromagnetic intensity adjusting focusing degree, the isolation plate can increase the independence between the adjacent devices to be tested, and meanwhile, the test intensity of the device to be tested can be adjusted from another angle, namely the side face.
Furthermore, the transmitting antenna is fixedly connected to an umbrella rib with a focus, the umbrella rib is fixedly connected with a reflecting cover, the transmitting antenna is located at the focus of the umbrella rib and faces towards the reflecting cover to transmit electromagnetic waves, the advancing direction of the electromagnetic waves reflected by the reflecting cover faces towards the equipment to be tested, and the umbrella rib is fixedly connected with a sliding piece for adjusting the umbrella shape.
Through the technical scheme, the electromagnetic waves generated by the transmitting antenna are concentrated and transmitted to the equipment to be tested in parallel by the reflecting cover, and after the shape of the transmitting cover is changed under the driving of the umbrella ribs, the energy density of the electromagnetic waves irradiated to the equipment to be tested is also changed without adjusting the position of the transmitting antenna and the power of the transmitting antenna, so that the aim of adjusting the testing environment of the equipment to be tested is fulfilled; if the power of the transmitting antenna is changed, the operating temperature and the electrical parameter drift of the transmitting antenna are changed, and the most constant operating state cannot be always maintained.
Furthermore, the umbrella ribs are connected in the anechoic chamber in a sliding mode, and the sliding direction of the umbrella ribs is parallel to the arrangement direction of the devices to be tested.
Through the technical scheme, the umbrella ribs with the transmitting antennas slide along the arrangement direction of the to-be-tested equipment, and the arranged to-be-tested equipment is tested in sequence.
Further, the umbrella ribs are rotatably connected in the anechoic chamber.
Through above-mentioned technical scheme, the rib can change the direction of advance of electromagnetic wave after rotating, shine on next equipment to be tested, and the stroke of rotation is littleer than gliding stroke, and also littleer to the dynamic influence of transmitting antenna.
Furthermore, a mirror surface layer is arranged on one surface of the reflection cover, which reflects the electromagnetic waves, and a rough and opaque wave-absorbing layer is arranged on one surface of the reflection cover, which is far away from the electromagnetic waves.
Through the technical scheme, the mirror layer can reflect more electromagnetic waves, the efficiency of the transmitting antenna for transmitting the electromagnetic waves to the equipment to be tested is improved, the wave absorbing layer can absorb the electromagnetic waves after multiple reflections so as to prevent the electromagnetic waves from being irradiated onto the equipment to be tested for multiple times, and the electromagnetic waves transmitted by the transmitting antenna are closer to the electromagnetic waves received by the equipment to be tested.
Further, the isolation plate is rotatably arranged in the anechoic chamber, the rotating direction of the isolation plate is coplanar with the advancing direction of the electromagnetic waves, and the isolation plate can shield or reflect more electromagnetic waves after rotating.
Through above-mentioned technical scheme, can let the equipment that awaits measuring shine less electromagnetic wave when the division board shelters from the electromagnetic wave after rotating, its surface can reflect more electromagnetic waves towards the electromagnetic wave back more after the division board rotates, lets the equipment that awaits measuring shine more electromagnetic waves.
Furthermore, it is connected with a plurality of parallel and the reflector strips and fixedly connected with of mutual linkage to rotate on the division board and be used for the drive reflector strip pivoted rotates the piece, the surface of reflector strip is the mirror surface setting.
Through the technical scheme, the isolation plate is not directly rotated, and the influence on adjacent equipment to be tested is reduced.
Furthermore, opaque reflective soft cloth is connected between adjacent reflective strips, and the surface of the reflective soft cloth is arranged in a mirror surface mode.
Through the technical scheme, the reflecting soft cloth can avoid electromagnetic wave leakage generated by gaps between adjacent reflecting strips, and influence on adjacent equipment to be tested is reduced.
Furthermore, the anechoic chamber is a shield body composed of hot galvanized steel sheets.
Through above-mentioned technical scheme, the shielding body can avoid the electromagnetic wave to leak, produces too much radiation to the personnel outside the electric wave darkroom.
Compared with the prior art, the invention has the beneficial effects that: the umbrella ribs and the reflecting cover are used for focusing electromagnetic waves to enable the transmitting antennas to be more concentrated, so that the testing of batches of devices to be tested is facilitated, the umbrella ribs can also adjust the advancing direction of the electromagnetic waves to test a single device to be tested, when the shape of the transmitting cover driven by the umbrella ribs is changed, the energy density of the electromagnetic waves irradiating the devices to be tested is also changed, the position of the transmitting antenna and the power of the transmitting antenna do not need to be adjusted, and the purpose of adjusting the testing environment of the devices to be tested is achieved; the isolation plate between the adjacent devices to be tested can increase the test independence, and can adjust the electromagnetic irradiation around the devices to be tested from the side.
Drawings
FIG. 1 is a schematic view of an anechoic chamber according to an embodiment;
FIG. 2 is a schematic overall structure diagram according to the first embodiment;
fig. 3 is a schematic structural diagram of a transmitting antenna according to an embodiment;
FIG. 4 is a schematic view showing the overall structure of a second separator according to an embodiment;
fig. 5 is an enlarged view of a portion a of fig. 4.
Reference numerals: 1. an anechoic chamber; 2. a device to be tested; 3. a separator plate; 4. a rotating seat; 5. a transmitting antenna; 6. umbrella ribs; 7. a reflector; 71. a mirror layer; 72. a wave-absorbing layer; 8. a sliding member; 9. an electric turntable; 10. a reflective strip; 11. a rotating member; 12. and reflecting soft cloth.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example one
A method for testing radiation immunity of radio frequency electromagnetic field of transmission type electronic equipment is disclosed, as shown in figure 1 and figure 2, comprising placing a plurality of equipment to be tested 2 in an anechoic chamber 1, wherein the anechoic chamber 1 is a shield body composed of hot galvanizing steel plates, and the shield body can avoid electromagnetic wave leakage and excessive radiation to personnel outside the anechoic chamber 1. After the devices to be tested 2 are arranged in a straight line, the devices to be tested 2 are mutually isolated by the isolating plate 3, and the isolating plate 3 is an aluminum plate with a polished surface being a mirror surface or a mirror with a silver film on the back surface. As shown in fig. 2 and 3, the bottom of the isolation plate 3 is rotatably connected with a rotating base 4, the rotating base 4 is a rotating device commonly used in the prior art, the isolation plate 3 can rotate in the anechoic chamber 1, the rotating direction of the isolation plate is parallel to the ground and coplanar with the advancing direction of the electromagnetic waves, the isolation plate 3 can shield or reflect more electromagnetic waves after rotating, the facing surface of the isolation plate 3 facing the electromagnetic waves is large, the reflecting surface of the isolation plate facing the device to be tested 2 can reflect more electromagnetic waves, the facing surface of the isolation plate 3 facing the electromagnetic waves is small and can reflect less electromagnetic waves, and the facing surface of the isolation plate 3 facing the electromagnetic waves is large and the reflecting surface of the isolation plate facing away from the device to be tested 2 can block more.
The anechoic chamber 1 is provided with a transmitting antenna 5, and the transmitting antenna 5 is connected with an electromagnetic wave generating device which is commonly used in the prior art and is used for testing electromagnetic tests. The transmitting antenna 5 is fixedly connected to an umbrella rib 6 with a focus, the umbrella rib 6 is connected to the anechoic chamber 1 in a sliding mode through an electric sliding rail in the prior art, the sliding direction of the umbrella rib 6 is parallel to the arrangement direction of the plurality of devices to be tested 2, the umbrella rib 6 drives the transmitting antenna 5 to slide along the arrangement direction of the devices to be tested 2, and the arranged devices to be tested 2 are sequentially tested. The transmitting antenna 5 is positioned at the focus of the umbrella rib 6, the reflecting cover 7 made of metal is glued or welded on the umbrella rib 6 and transmits electromagnetic waves towards the reflecting cover 7, and the reflecting cover 7 on the umbrella rib 6 can focus the electromagnetic waves transmitted by the transmitting antenna 5. The surface of the reflection cover 7, which reflects the electromagnetic waves, is provided with a mirror layer 71 made of aluminum foil or silver foil, and the mirror layer 71 can reflect more electromagnetic waves, so that the efficiency of the transmitting antenna 5 transmitting the electromagnetic waves to the device to be tested 2 is improved.
The surface of the reflection cover 7 far away from the electromagnetic wave is provided with a rough and opaque wave absorbing layer 72, the wave absorbing layer 72 can be made of black paper or dense black cloth with rough surface, and a metal mesh woven by metal filaments is arranged in the black paper or the black cloth. The wave absorbing layer 72 can absorb the electromagnetic waves after multiple reflections to prevent the electromagnetic waves from being irradiated onto the device to be tested 2 multiple times, so that the electromagnetic waves emitted by the transmitting antenna 5 are closer to the electromagnetic waves received by the device to be tested 2. The electromagnetic wave after the reflection of bowl 7 direction of advance is towards the equipment 2 of awaiting measuring, and the umbrella shape is adjusted to welding or fix through the bolt on the rib 6 and sliding 8, and sliding 8 adopts electric cylinder, and electric cylinder's one end is fixed with rib 6, and its other end is fixed with the umbrella stick, and the umbrella shape can be adjusted after electric cylinder's telescopic link moves.
And adjusting the advancing direction of the electromagnetic waves, sequentially aligning the electromagnetic waves to a plurality of devices to be tested 2, and sequentially detecting a single device to be tested 2. When the transmitting direction of the transmitting antenna 5 is aligned to different devices to be tested 2, the focusing degree is adjusted according to the preset electromagnetic intensity, and the focusing degree and the electromagnetic intensity are in positive correlation setting. The reflection degree of the electromagnetic wave emitted by the transmitting antenna 5 by the isolation board 3 is adjusted, and the reflection degree and the electromagnetic intensity are in positive correlation.
The umbrella ribs 6 and the reflecting cover 7 are used for focusing electromagnetic wave energy to enable the transmitting antenna 5 to be more concentrated, so that the batch testing of the devices 2 to be tested is facilitated, the umbrella ribs 6 can also adjust the advancing direction of the electromagnetic wave to test a single device 2 to be tested, after the shape of the transmitting cover is changed by the umbrella ribs 6, the energy density of the electromagnetic wave irradiating the devices 2 to be tested is also changed, the position of the transmitting antenna 5 and the power of the transmitting antenna 5 do not need to be adjusted, and the purpose of adjusting the testing environment of the devices 2 to be tested is achieved; the division board 3 between the adjacent equipment 2 that awaits measuring then can increase the independence of test, can also adjust the electromagnetic exposure volume around the equipment 2 that awaits measuring simultaneously from the side, can let the equipment 2 that awaits measuring shine less electromagnetic wave in the time of shielding the electromagnetic wave after the division board 3 rotates, and its surface can reflect more electromagnetic waves more towards the electromagnetic wave after 3 rotations of division board, lets the equipment 2 that awaits measuring shine more electromagnetic waves. The method can test a plurality of devices to be tested 2 at one time, and has the advantage of being capable of testing quickly and accurately.
Example two
A testing method for radiation immunity of radio frequency electromagnetic field of transmission electronic equipment is disclosed, as shown in fig. 4 and fig. 5, the difference of the first embodiment is that an umbrella rib 6 is connected in an anechoic chamber 1 through an electric turntable 9 in a rotating way, the advancing direction of electromagnetic wave can be changed after the umbrella rib 6 rotates, the electromagnetic wave irradiates on the next equipment to be tested 2, the rotating stroke is smaller than the sliding stroke, and the dynamic influence on a transmitting antenna 5 is smaller. Rotating through the bearing on the division board 3 and being connected with a plurality of parallel and the reflector strips 10 that link each other, the lower extreme welding of division board 3 or be used for driving reflector strips 10 pivoted through bolt fixedly connected with and rotate piece 11, rotate piece 11 and adopt step motor, step motor passes through the gear with a plurality of reflector strips 10 and is connected with chain drive, does not directly rotate division board 3, reduces the influence to adjacent equipment 2 that awaits measuring production. The surface of the reflective strip 10 is a mirror surface and is made of metal foil. The adjacent reflecting strips 10 are glued, welded or integrally connected with opaque reflecting soft cloth 12, the reflecting soft cloth 12 is also made of metal foil, and the surface of the reflecting soft cloth 12 is arranged in a mirror surface mode. The reflective soft cloth 12 can prevent electromagnetic wave leakage from the gap between adjacent reflective strips 10, and reduce the influence on the adjacent devices 2 to be tested.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A method for testing radiation immunity of radio frequency electromagnetic field of transmission electronic equipment is characterized by comprising the following steps:
placing a plurality of devices to be tested (2) in an anechoic chamber (1), and mutually isolating the plurality of devices to be tested (2) by using an isolation plate (3);
arranging a transmitting antenna (5) in the anechoic chamber (1) and focusing the electromagnetic wave transmitted by the transmitting antenna (5);
adjusting the advancing direction of the electromagnetic waves, sequentially aligning to a plurality of devices to be tested (2) in sequence, and sequentially detecting a single device to be tested (2);
when the transmitting direction of the transmitting antenna (5) is aligned to different devices to be tested (2), adjusting the focusing degree according to the preset electromagnetic intensity, wherein the focusing degree and the electromagnetic intensity are in positive correlation setting;
adjusting the reflection degree of the isolation board (3) to the electromagnetic wave emitted by the transmitting antenna (5), wherein the reflection degree and the electromagnetic intensity are in positive correlation arrangement;
transmitting antenna (5) fixed connection is on rib (6) that have the focus, rib (6) fixedly connected with bowl (7), transmitting antenna (5) are located the focus department of rib (6), and orientation bowl (7) transmission electromagnetic wave, the direction of advance of the electromagnetic wave after bowl (7) reflection is towards awaiting measuring equipment (2), sliding piece (8) of fixedly connected with adjustment umbrella type on rib (6).
2. The method according to claim 1, characterized in that the umbrella ribs (6) are connected in the anechoic chamber (1) in a sliding manner, and the sliding direction of the umbrella ribs is parallel to the arrangement direction of the plurality of devices to be tested (2).
3. Method according to claim 1, characterized in that said ribs (6) are rotatably connected in said anechoic chamber (1).
4. Method according to claim 1, characterized in that the side of the reflector (7) reflecting the electromagnetic waves is provided with a mirror layer (71), and the side facing away from the electromagnetic waves is provided with a rough and opaque wave-absorbing layer (72).
5. The method according to claim 1, wherein the isolation plate (3) is rotatably disposed in the anechoic chamber (1), the rotation direction of the isolation plate (3) is coplanar with the proceeding direction of the electromagnetic wave, and the isolation plate (3) is rotated to block or reflect more electromagnetic wave.
6. The method according to claim 1, characterized in that a plurality of parallel and mutually linked reflecting strips (10) are rotatably connected on the isolation plate (3) and a rotating piece (11) for driving the reflecting strips (10) to rotate is fixedly connected, and the surface of the reflecting strips (10) is a mirror surface.
7. The method according to claim 6, characterized in that an opaque reflecting soft cloth (12) is connected between the adjacent reflecting strips (10), and the surface of the reflecting soft cloth (12) is a mirror surface.
8. The method according to claim 1, characterized in that the anechoic chamber (1) is a shield consisting of hot-dip galvanized steel sheet.
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| CN114252760B (en) * | 2021-12-23 | 2023-06-06 | 中国人民解放军国防科技大学 | Integrated circuit electromagnetic compatibility measuring device, system and method |
| CN114705929B (en) * | 2022-03-11 | 2023-03-03 | 苏州熠品质量技术服务有限公司 | Anti-interference test equipment for close-range electric field |
| CN116859135B (en) * | 2023-08-31 | 2023-10-31 | 辽宁信鼎检测认证有限公司 | Communication contrast test system suitable for wireless product |
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